We have a ‘hardcoded text translation script’ addon that works in conjunction with the multilingualizer, specifically for hard-coded text in Squarespace:

https://www.multilingualizer.com/support/squarespace-multilingualizer-tips/

There’s also this approach you can use, using CSS to change the text – it’s a little complicated at first but easy once you’ve done it once:

https://www.multilingualizer.com/support/advanced-customisation-techniques-per-language/